Carburetor



Oct. 4, 1932.

F. 0. BALL ET AL CARBURETOR Filed Sept. 20. 1927 NH ll W0 fizz. W752. @262 IN V EN TORS BY 7 2 KM ATTORNEYS.

Patented Oct. 4, 1932 UNITED STATES PATENT OFFICE FREDERICK 0. BALL AND THOMAS M. BALL, OF DETROIT, MICHIGAN, ASSIGNORS TO BALL & BALL CABBURETOR COMPANY, OF DETROIT, MICHIGAN, A PARTNERSHIP COM- POSED OF FREDERICK 0. BALL AND CORNELIA M. BALL CARIBUBETOB Application filed September 20, 1927. Serial No. 220,775.

In this construction, 1 marks the carburetor body, 1a the mixing chamber forming a part of the suction passage, 2 a throttle valve, 3.

the throttle valve spindle, 4 the carburetor'inlet, 5 the choke valve operating in the inlet, 6 the fuel nozle, 7 a fuel well surrounding the nozzle and communicating through a series of passages 8 with the nozzle, the well communicating with the air through a passage 9. Fuel is delivered to the well through a passage 10, this extending to a vertical'opening lldn the carburetor body. A plug 12 is arranged in the bottom of the passage and has a metered opening 13, the metered opening leading to radial openings 14. A passage 15 leads to the radial openings 14 and from a float chamber' 16. A float 17 is arranged in the float chamber and operates a supply valve 18. These parts are, or may be, of ordinary construction.

A metering plug 19, is screwed into the opening 11 above the passage 10 and is provided with a metering opening 20. An idling tube 21 is secured in the plug 20 and extends upwardly through an opening 22 at the top 0 the passage 11 making a tight fit in the opening 22. A well 23 is formed around the tube 21, the tube being smaller than the openmg, or passage 11.

I bypass opening 24 terminates in a restriction 25 leading tothe mixin chamber immediately below the upper sur ace of the throttle when closed. The bypass opening 24 is connected by a passage 26 with a fuel discharge opening 27 terminating in the restriction with the walls of the opening 26 I which has a metering function in the flow of air through the bypass. The plugs 12 and 19 may be readily removed thus permitting of the insertion of a new fuel tube of slightly different gauge in that portion of the tube extending through the passage 26 and this changes the capacity of the bypass without drilling, or machine Work on the body of the carburetor. The different sized tubes may, therefore, be supplied as an accessory and used as required under varying conditions.

An opening 30 is made through the fuel tube at approximately the fuel level form ing a communication with the well 23 and an opening 31 extends from the atmosphere to the upper end of this well. These passages 30 and 31 are usually employed, but are not necessarily employed, the introduction of air making the flow through the fuel tube somewhat more delicate in response than where they are omitted but the device will function Without such air feed. It will be noted that with the initial opening of thethrottle 2 its blade is brought below the restriction 25 and thus the opening 24 is subject to the reduction of pressure above the throttle and also to the reduction of pressure incident to the very rapid flow past the throttle at this point. This increases, therefore, the suction efi'ort through the opening 24, passage 26 and upon the tube 21 and consequently increases the flow of fuel at speeds slightly above the idling speed. This is desirable because one of the greatest faults in carburetion using a bypass idle is the failure to secure a smooth transfer from the idle (when all the fuel goes up the bypass) to higher speeds when fuel is delivered by both bypass and main discharge nozzle. It Will be noted also that While this increase takes place it does not interfere with the adjustment through the needle valve of the idling condition. While we have shown the tube 21 as controlling the restriction in the passage 26 bewalls of the tube opening and'the tube, the.

means of controllmg, or varying the restric tion between the passages 24 and 27.

What we claim as new is 1. In a carburetor, the combination of a suction passage; a throttle in the suction passage; a fuel delivery passage leading to the suction passage; an idling device comprising a discharge opening above the throttle; a hiypass opening below the upper surface of t e throttle when closed; a tube openingbetween the discharge and bypass openings; and a fuel tube extending through the tube opening and forming a metering restriction between the bypass opening delivering air through the connecting passage to the discharge opening independently of the fuel tube.

'2. In a carburetor, the combination of a suction passage; a throttle in the suction passage; a fuel delivery passage leading to the suction passage; an idling device comprising a discharge opening above the throttle; a

bypass .opening below the upper surface of the throttle when closed; a tube opening between the discharge and bypass opemngs; and a removable fuel tube extending through the tube opening and forming a metering restriction between the walls of the tube opening and the tube, the bypass opening delivering air through the connecting passage to the dilsoiharge opening independentlyv of the fuel tu 3. In a carburetor, the combination of a suction passage; a throttle in the suction passage; a fuel delivery passage leading to the suction passage; an idling device comprising a discharge opening above the throttle; a bypass opening below the upper surface of the throttle when closed; a tube opening between'the discharge and bypass openings; a fuel tubeextending through the tube opening and forming a metering restriction'between the walls of the tube opening and the tube; the bypass opening deliverng air through the connecting passage to the discharge opening independently of the fuel tube and a removable plug on which the tube is mounted.

4. In a carburetor, the combination of a suction passage; a throttle in the suction passage; a fuel delivery passage leading to the suction passage; an idling device comprising (a discharge opening above the throttle; a bypass opening below the upper surface of the throttle when closed; a tube opening between the discharge and bypass openings; a fuel tube extending through the tube opening and forming a metering restriction between the walls of the tube opening and the tube; the bypass opening delivering air through the connecting passa e to the discharge opening independently o the fuel tube and an air delivery means leading to the tube.

5. In a carburetor, the combination of a. suction passage; :1 throttle in the suction passage; a fuel delivery passage leading to the suction passage; an idling device comprising a discharge opening above the throttle; a bypass opening immediately below the upper surface of the throttle when closed in position to reduce the pressure through thebypass on the initial opening of the throttle;

a tube opening between the discharge opening and the bypass opening; and a fuel tube extending through the tube opening and. forming a metering restriction between the walls of the tube opening and the tube, said bypass opening delivering air through the tube opening to the dischargeopening independently of the fuel tube.

6. In a carburetor, the combination of a suction passage; a throttle in the suction passage; a fuel delivery passage leading to the suction passage; an idling device comprising a discharge opening above the throttle; a bypass opening immediately below the upper surface of the throttle when closed and in osition to reduce the pressure through the ypass on the initial opening of the throttle;

a tube opening connecting the dischar e opening and the bypass opening; a fuel tu e extending through the bypass opening andtube opening and forming a restriction between the tube, said bypass delivering air through the tube opening to the discharge opening independently of the fuel tube and the walls of the tube opening; a removable plug in which the tube is mounted havin a metering opening leading to the tube, sai metering opening opening to the fuel passage; and a metering plug in the fuel passa e in alinement with the tube.

In a carburetor, the combination of a suction passage, a throttle in said suction passage, a fuel delivery passage leading to the suction passage, an idling device comprising a discharge opening above the throttle, a by-pass opening immediately below the upper surface of the throttle when closed,

a passage connecting the discharge opening and the by-pass opening, means controlling the size of the discharge opening, and a fuel tube projecting into the connecting passage and extending from the fuel supply to the" discharge opening, the by-pass opening delivering air through the connecting passage iao to the discharge opening independently of an outletto the suction passage immediately at and below the upper surface of the throttle when closedand in position to reduce the pressure to the by-pass on the initial opening of the throttle, and a fuel delivery conduit projecting. into said connecting passage and leading to the delivery opening and responsive to -by-pass pressure.

9. In a carburetor, the combination of a suction passage, a throttle in the suction passage, a fuel delivery passage leading to the suction passage, an idling device comprising a fuel delivery opening above the throttle, a y-pass having a passage connected with said delivery opening, said by-pass having an opening immediately at and below the upper sur ace of the throttle when closed and in position to reduce the pressure to the by-pass on the initial opening of the throttle, a fuel delivery conduit projecting through said connecting passage leading to the delivery opening and responsive to by-pass pressure, and a valve regulating the discharge opening.

In testimony whereof we have hereunto setour hands. a v I FREDERICK 0. BALL. THOMAS M. BALL. 

